Summary File 4 (SF4) contains the sample data, which is the
information compiled from the questions asked of a sample of all
people and housing units.

The sample data are presented in 213 population tables (matrices)
and 110 housing tables, identified with "PCT" and "HCT",
respectively. Each table is iterated for 336 population groups: the
total population, 132 race groups, 78 American Indian and Alaska
Native tribe categories (reflecting 39 individual tribes), 39
Hispanic or Latino groups, and 86 ancestry groups.

SF 4 is released as individual files for each of the 50 states,
the District of Columbia, and Puerto Rico; and for the United
States. The tables (matrices) are identical for all files, but the
geographic coverage differs. Data are provided down to the census
tract level.

Summary File 3 consists of 813 detailed tables of Census 2000
social, economic and housing characteristics compiled from a sample
of approximately 19 million housing units (about 1 in 6 households)
that received the Census 2000 long-form questionnaire. Fifty-one
tables are repeated for nine major race and Hispanic or Latino
groups: White alone; Black or African American alone; American
Indian and Alaska Native alone; Asian alone; Native Hawaiian and
Other Pacific Islander alone; Some other race alone; Two or more
races; Hispanic or Latino; and White alone, not Hispanic or Latino.

Summary File 3 presents data for the United States, the 50
states, the District of Columbia and Puerto Rico in a hierarchical
sequence down to the block group for many tabulations, but only to
the census tract levels for others. Summaries are included for other
geographic areas such as Zip Code Tabulation Areas (ZCTAsTM) and Congressional districts
(106th Congress).

Summary File 3 includes 484 population tables and 329 housing
tables that are identified according to geographic coverage:

Population (P) and Housing (H) tables are available to the
block group

Population (PCT) and Housing (HCT)
tables are available to the census tract level
only

A profile includes four tables that provide various demographic, social,
economic, and housing characteristics for the United States, states,
counties, minor civil divisions in selected states, places, metropolitan
areas, American Indian and Alaska Native areas, Hawaiian home lands
and congressional districts. It includes 100-percent and sample data from
Census 2000.

There are four tables in the Demographic Profile, labeled (DP-1
thru DP-4). For Census 2000 data, the DP-1 table is available as part
of the Summary File 1, and the other three tables are available as part
of the Summary File 3 data set.

Summary File 2 (SF2) contains 47 detailed tables focusing on age, sex, households, families, and occupied housing units for the total population. These tables are repeated for 249 detailed population groups based on the following criteria:

no tables are available for geographic areas
having a population of less than 100

tables are repeated only for the race groups,
American Indian and Alaska Native tribes, and Hispanic or Latino groups
having a population of 100 or more within the geographic area.

For a complete list of the 249 population groups, see Appendix H of the SF 2 Technical Documentation (PDF).

Data collection for the Census 2000 Supplementary Survey began in November 1999 in 1,203 counties and ran through December 2000. Residents at approximately 58,000 addresses were contacted each month. Although the survey was conducted in only 1,203 counties, it is important to note that this size sample is sufficient to produce data for every state in the Nation, as well as for counties and most metropolitan areas of 250,000 in population or more.

Tables

Table QT-01. Profile of General Demographic Characteristics for Colorado: 2000